Java InputStream Read by Charset toString(InputStream input, String charset)

Description

to String

License

Apache License

Declaration

public static final String toString(InputStream input, String charset)
            throws IOException, UnsupportedEncodingException 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.WritableByteChannel;

public class Main {
    private static final int DEFAULT_BUFFER_SIZE = 8192;

    public static final String toString(InputStream input, String charset)
            throws IOException, UnsupportedEncodingException {
        return new String(toByteArray(input, false), charset);
    }//w  w w .j a va 2 s .  co m

    public static final byte[] toByteArray(InputStream input, boolean nioCopy) throws IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        if (nioCopy)
            nioCopy(input, baos);
        else
            copy(input, baos);

        return baos.toByteArray();
    }

    public static final void nioCopy(InputStream input, OutputStream output) throws IOException {
        nioCopy(Channels.newChannel(input), Channels.newChannel(output));
    }

    public static final void nioCopy(ReadableByteChannel input, WritableByteChannel output) throws IOException {
        try {
            ByteBuffer buffer = ByteBuffer.allocate(DEFAULT_BUFFER_SIZE);
            while (input.read(buffer) != -1) {
                //Flip buffer
                buffer.flip();
                //Write to destination
                output.write(buffer);
                //Compact
                buffer.compact();
            }

            //In case we have remainder
            buffer.flip();
            while (buffer.hasRemaining()) {
                //Write to output
                output.write(buffer);
            }
        } finally {
            if (input != null) {
                input.close();
                input = null;
            }

            if (output != null) {
                output.close();
                output = null;
            }
        }
    }

    public static final int copy(InputStream input, OutputStream output) throws IOException {
        byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
        int totalBytesRead = 0;
        int bytesRead = 0;

        while (-1 != (bytesRead = input.read(buffer))) {
            output.write(buffer, 0, bytesRead);
            totalBytesRead += bytesRead;
        }

        return totalBytesRead;
    }
}

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